package com.run.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.run.common.constant.EsConstant;
import com.run.common.to.es.SkuEsModel;
import com.run.common.utils.R;
import com.run.gulimall.search.config.GulimallElasticConfig;
import com.run.gulimall.search.feign.ProductFeignService;
import com.run.gulimall.search.service.MallSearchService;
import com.run.gulimall.search.vo.AttrResponseVo;
import com.run.gulimall.search.vo.BrandVo;
import com.run.gulimall.search.vo.SearchParam;
import com.run.gulimall.search.vo.SearchResult;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @Date: 2021/11/02/14:14
 * @Description:
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {

    //用来进行检索操作的对象
    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param) {
        //动态构建出查询需要的DSL语句
        SearchResult result = null;

        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);
        //构建检索请求


        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticConfig.COMMON_OPTIONS);
            //3、分析响应数据，封装成我们需要的格式
            result = buildSearchResult(response, param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                //获取设置高亮string
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String highLight = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(highLight);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        //2、当前所有商品涉及到的所有属性信息
        ArrayList<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attrs_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //2.1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            //2.2、得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //2.3、得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            result.getAttrIds().add(attrId);

            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        //3、当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //2、得到品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            //3、得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            //封装信息
            brandVo.setBrandId(brandId);
            brandVo.setBrandImg(brandImg);
            brandVo.setBrandName(brandName);
            brandVos.add(brandVo);

        }
        result.setBrands(brandVos);

        //4、当前所有商品涉及到的所有聚合分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //5、分页信息-页码
        result.setPageNum(param.getPageNum());

        //5.1、分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);

        //5.2、分页信息-总页码
        int totalPages = ((int) total % EsConstant.PRODUCT_PASIZE == 0 ? (int) total / EsConstant.PRODUCT_PASIZE : (int) total / EsConstant.PRODUCT_PASIZE + 1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        // 6.构建面包屑导航功能
        if(param.getAttrs() != null){
            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.getAttrsInfo(Long.parseLong(s[0]));
                // 将已选择的请求参数添加进去 前端页面进行排除
                result.getAttrIds().add(Long.parseLong(s[0]));
                if(r.getCode() == 0){
                    AttrResponseVo data = (AttrResponseVo)r.getData("attr", new TypeReference<AttrResponseVo>(){});
                    navVo.setNavName(data.getAttrName());
                }else{
                    // 失败了就拿id作为名字
                    navVo.setNavName(s[0]);
                }
                // 拿到所有查询条件 替换查询条件
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(navVos);
        }

        // 品牌、分类
        if(param.getBrandId() != null && param.getBrandId().size() > 0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            // TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if(r.getCode() == 0){
                List<BrandVo> brand = (List<BrandVo>) r.getData("brand", new TypeReference<List<BrandVo>>() {});
                StringBuffer buffer = new StringBuffer();
                // 替换所有品牌ID
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName() + ";");
                    replace = replaceQueryString(param, brandVo.getBrandId() + "", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navs.add(navVo);
        }

        return result;
    }
    /**
     * 替换字符
     * key ：需要替换的key
     */
    private String replaceQueryString(SearchParam Param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value,"UTF-8");
            // 浏览器对空格的编码和java的不一样
            encode = encode.replace("+","%20");
            encode = encode.replace("%28", "(").replace("%29",")");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return Param.get_queryString().replace("&" + key + "=" + encode, "");
    }

    /**
     * 准备检索请求
     * 模糊匹配、过滤(按照属性、分类、品牌、价格区间、库存)、排序、分页、高亮、聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句的对象
        /**
         *  查询：模糊匹配、过滤(按照属性、分类、品牌、价格区间、库存)
         */
        //1、构建bool query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、构建must 不为空就开始构建must中的match
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2.1、构建bool filter 不为空就构建 filter中的term [按照三级分类id查询]
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2.2、filter中的term [按照品牌id查询]
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termQuery("brandId", param.getBrandId().get(0)));
        }
        //1.2.3、filter中的term [嵌套查询]
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String attr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attr : 检索条件 [如：attrs=1_5寸:8寸]
                String[] attrSplit = attr.split("_");
                String attrId = attrSplit[0];//检索的属性id
                String[] attrValuesSpilt = attrSplit[1].split(":");//这个属性的检索使用的值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                //测试时可注释掉
//                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValuesSpilt));
                //每个属性都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        //1.2.4、filter中的term [按照是否拥有库存进行查询]
        if (param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }
        //1.2.5、filter中的term [按照价格区间进行查询]
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            //传过来的数据为_500/100_500/500_类型的数据，所以需要解析
            String[] skuPriceSplit = param.getSkuPrice().split("_");
            if (skuPriceSplit.length == 2) {
                //区间
                rangeQuery.gte(skuPriceSplit[0]);
                rangeQuery.lte(skuPriceSplit[1]);
            } else if (skuPriceSplit.length == 1) {
                //大于或者小于
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQuery.gte(0);
                    rangeQuery.lte(skuPriceSplit[0]);
                } else if (param.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(skuPriceSplit[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQuery);

        /**
         *  排序、分页、高亮
         */
        //2.1、排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            //sort = hostScore_asc/desc
            String[] sortSplit = sort.split("_");
            SortOrder order = sortSplit[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(sortSplit[0], order);
        }
        //2.2、分页    from = (pageNum - 1) * size
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PASIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PASIZE);
        //2.3、高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }
        /**
         *  聚合分析
         */
        //1、品牌聚合  brand
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg").field("brandId").size(50);
        //1.1、品牌子聚合 [品牌名字和品牌图片]
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName.keyword").size(50));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg.keyword").size(50));
        sourceBuilder.aggregation(brand_agg);

        //2、分类聚合 catalog
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName.keyword").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3、属性聚合 attr
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attrs_agg", "attrs");
        //3.1、聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //3.1.1、聚合分析出当前attr_id对应的attr_name
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName.keyword").size(1));
        //3.1.2、聚合分析出当前attr_id对应的所有可能的属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue.keyword").size(50));
        //3、将这个子聚合加入嵌入式聚合
        attr_agg.subAggregation(attr_id_agg);

        sourceBuilder.aggregation(attr_agg);


//        System.out.println("构建的dsl语句：" + sourceBuilder.toString());
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);//构建检索请求


        return searchRequest;
    }

}
